標題: Joint Sensing Duration Adaptation, User Matching, and Power Allocation for Cognitive OFDM-NOMA Systems
作者: Xu, Wenjun
Li, Xue
Lee, Chia-Han
Pan, Miao
Feng, Zhiyong
電機工程學系
Department of Electrical and Computer Engineering
關鍵字: NOMA;OFDM;cognitive radio;cognitive OFDM-NOMA systems;matching theory;non-cooperative game
公開日期: 1-Feb-2018
摘要: In this paper, the non-orthogonal multiple access (NOMA) technology is integrated into cognitive orthogonal frequency-division multiplexing (OFDM) systems, called cognitive OFDM-NOMA, to boost the system capacity. First, a capacity maximization problem is considered in half-duplex cognitive OFDM-NOMA systems with two accessible users on each subcarrier. Due to the intractability of the considered problem, we decompose it into three subproblems, i.e., the optimization of, respectively, sensing duration, user scheduling, and power allocation. By investigating and exploiting the characteristics of each subproblem, the optimal sensing duration adaptation, a matching-theory-based user scheduling, and the optimal power allocation are proposed correspondingly. An alternate iteration framework is further proposed to jointly optimize these three subproblems, with its convergence proved. Moreover, based on the non-cooperative game theory, a generalized power allocation algorithm is proposed and then used in the framework to accommodate half-duplex cognitive OFDM-NOMA systems with multiple users on each subcarrier. Finally, the proposed framework is extended to solve the capacity maximization problem in full-duplex cognitive OFDM-NOMA systems. Simulation results validate the superior performance of the proposed algorithms. For example, for the case of two accessible users, the proposed framework approaches the optimal solution with less than 1% capacity loss and 120 times lower complexity compared with exhaustive search.
URI: http://dx.doi.org/10.1109/TWC.2017.2777476
http://hdl.handle.net/11536/144516
ISSN: 1536-1276
DOI: 10.1109/TWC.2017.2777476
期刊: IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
Volume: 17
起始頁: 1269
結束頁: 1282
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